Researcher:
Atıcı, Çağdaş

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Çağdaş

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Atıcı

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Atıcı, Çağdaş

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2006 - 20085

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Researcher Of Publications: search.filters.isAuthorOfPublication.118919b4-004c-4ee4-a0e8-b38342d967b3

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    Cross-layer design for wireless H.264/AVC video broadcasting system
    (IEEE, 2007) N/A; Department of Electrical and Electronics Engineering; Atıcı, Çağdaş; Sunay, Mehmet Oğuz; PhD Student; Faculty Member; Department of Electrical and Electronics Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; N/A
    Wireless video broadcasting is a complicated problem in which the number of users receiving the service and the average received video quality have to be intelligently optimized. In this paper, we propose a novel, multiple objective optimized cross-layer H.264/AVC video broadcasting scheme for a wireless system that supports a variety of transmission data-rates. The optimal compromise operating point, which includes H.264/AVC and physical layer parameters, between the maximization of the average received video PSNR and the minimization of the service outage probability is found using the multi-objective, cross-layer optimization. Simulations done for the ITU Pedestrian A and Vehicular B channels show that high-data rates with low outages are possible for video broadcasting using a cross-layer design.
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    Multi-layered video broadcasting over 1xEV-DO using multiple objective optimization
    (Institute of Electrical and Electronics Engineers (IEEE), 2006) N/A; Department of Electrical and Electronics Engineering; Atıcı, Çağdaş; Sunay, Mehmet Oğuz; PhD Student; Faculty Member; Department of Electrical and Electronics Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A: N/A
    In cellular environments video broadcasting is a challenging problem in which the number of users receiving the service and the average QoS has to be intelligently optimized. For video broadcasting in a 1xEV-DO system, the orthogonal Walsh codes may be distributed among the multiple layers of the scalable coded video stream. In this paper, we propose a novel, multiple objective optimized, multi-layered video broadcasting scheme for the 1xEV-DO system. With this scheme, the average observed service quality is maximized while minimizing the total number of time slots in which individual mobile subscribers experience outages. Simulations done for the ITU Pedestrian A and Vehicular B channels show that our proposed scenario provide significant increase to the average service quality while maintaining the total number of slots receiving no service as small as in original scenario.
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    System optimization for peer-to-peer multi hop video broadcasting in wireless ad Hoc networks
    (IEEE, 2008) N/A; N/A; Department of Electrical and Electronics Engineering; Department of Industrial Engineering; Dedeoğlu, Volkan; Atıcı, Çağdaş; Sunay, Mehmet Oğuz; Salman, Fatma Sibel; Master Student; PhD Student; Faculty Member; Faculty Member; Department of Electrical and Electronics Engineering; Department of Industrial Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Engineering; College of Engineering; N/A; N/A; N/A; 178838
    We consider peer-to-peer video broadcasting using cooperation among peers in an ad hoc wireless network. As opposed to the traditional single hop broadcasting, multiple hops cause an increase in broadcast video quality while creating interference and increasing transmission delay. We develop heuristics for the NP-complete problem of finding the subset of cooperating peers and the number of hops to maximize the data rate and to minimize the maximum observed delay in the system. Simulations show that using the proposed heuristics, different video sequences can be viewed at high qualities with acceptable delay among all peers.
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    High data-rate video broadcasting over 3G wireless systems
    (IEEE-Inst Electrical Electronics Engineers Inc, 2007) N/A; Department of Electrical and Electronics Engineering; Atıcı, Çağdaş; Sunay, Mehmet Oğuz; PhD Student; Faculty Member; Department of Electrical and Electronics Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; N/A
    In cellular environments, video broadcasting is a challenging problem in which the number of users receiving the service and the average successfully decoded video data-rate have to be intelligently optimized. When video is broadcasted using the 3G packet data standard, 1xEV-DO, the code space may be divided among the multiple layers if scalable video coding is employed. In this paper, we propose a novel, multi-objective optimized video broadcasting scheme for 1xEV-DO and investigate the feasibility of using multiple layers for transmission. The multi-objective optimization aims to find the best compromise between maximizing the average decodable video data-rate and minimizing the basic quality video outage probability. Simulations conducted for, the ITU Pedestrian A and Vehicular B channels show that high data-rates with low outages are possible when 1xEV-DO is used for video broadcasting, however, it may not be desirable to use scalable video coding for this purpose.
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    Cross-layer design for wireless video broadcasting using H.264/AVC
    (IEEE, 2007) N/A; Department of Electrical and Electronics Engineering; Atıcı, Çağdaş; Sunay, Mehmet Oğuz; PhD Student; Faculty Member; Department of Electrical and Electronics Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; N/A
    In cellular environments, video broadcasting is a challenging problem in which the number of users receiving the service and the average video quality of the received stream have to be intelligently optimized. In this paper, we propose a novel, multi-objective optimized cross-layer video broadcasting scheme for a wireless system capable of supporting a multitude of transmission data-rates using the H.264/AVC. The multi-objective, cross-layer optimization aims to find the H.264/AVC as well as the physical layer parameters jointly to reach the optimal compromise between maximizing the average received video PSNR and minimizing the video broadcast service outage probability. Simulations conducted for the ITU Pedestrian A and Vehicular B channels show that high data-rates with low outages are possible for video broadcasting when such a cross-layer design is used.